Despite or maybe inspite of the the “Argy bargy” , this is a fascinating thread, raising some questions about a part , that often, just gets fitted without question....what else is there.....

In the absence of another solution i will still fit one, yes advertising blurb is OTT, but it does allow control of max presure to carb and, as far as i can see, it smoothes out pulses from pump, which i suspect rattle the needle valve off its seat some times.

Dont stop posting Peter, you are after all, a catalyst for this thread, enviroment though is closer to down the pub than in the classroom - might be worth reserving longer articles for a tech library...?

Peter, hopefully you didn’t take offense at my reply, I was just trying to break the problem (as I perceived it) down into steps, and the only filter king claims which I could correlate to the problem were the result of regulating variations in the fuel pump pressure.

Turns out the paragraph in my description of how I thought the filter king might actually work as a regulator was 100% wrong - the diaphragm explanation seems much more likely. But that’s fine by me - just the kind of discussion that makes this forum so valuable. I’d call that a successful thread, and thanks for raising the topic.

Regarding substantiation of their claims, smoothing flow could result in better fuel economy, as the over-rich fueling would no longer occur. That RAC test claims 10% which seems a little on the high side to me. The rest of the claims, in my opinion, are marketing bullshit.

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